Sheth Fabricators Pvt. Ltd. Manufactures Interlocking Door for Man/Air Trap Application. Sheth Fabricators Pvt. Ltd. Is an ISO 9001 awarded company that also manufactures wide range Industrial safe doors. Interlocking Door for Man/Air Trap Application has a pre-defined entry and exit and operating rules, which can be either microprocessor based or PLC controlled. This system is used for restricting unauthorized movement of man and unwanted air. These interlocking doors have full-coat internal contact adhesives, which enables permanent pressure bond and prevents rust. The Kraft honeycomb core provides structural strength along with flatness. These are available in red, brown, white, green, grey and blue colours.